--- /dev/null
+/* Copyright (c) 2010-2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "hdmi.h"
+#include <linux/qcom_scm.h>
+
+#define HDCP_REG_ENABLE 0x01
+#define HDCP_REG_DISABLE 0x00
+#define HDCP_PORT_ADDR 0x74
+
+#define HDCP_INT_STATUS_MASK ( \
+ HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_INT | \
+ HDMI_HDCP_INT_CTRL_AUTH_FAIL_INT | \
+ HDMI_HDCP_INT_CTRL_AUTH_XFER_REQ_INT | \
+ HDMI_HDCP_INT_CTRL_AUTH_XFER_DONE_INT)
+
+#define AUTH_WORK_RETRIES_TIME 100
+#define AUTH_RETRIES_TIME 30
+
+/* QFPROM Registers for HDMI/HDCP */
+#define QFPROM_RAW_FEAT_CONFIG_ROW0_LSB 0x000000F8
+#define QFPROM_RAW_FEAT_CONFIG_ROW0_MSB 0x000000FC
+#define HDCP_KSV_LSB 0x000060D8
+#define HDCP_KSV_MSB 0x000060DC
+
+enum DS_TYPE { /* type of downstream device */
+ DS_UNKNOWN,
+ DS_RECEIVER,
+ DS_REPEATER,
+};
+
+enum hdmi_hdcp_state {
+ HDCP_STATE_NO_AKSV,
+ HDCP_STATE_INACTIVE,
+ HDCP_STATE_AUTHENTICATING,
+ HDCP_STATE_AUTHENTICATED,
+ HDCP_STATE_AUTH_FAILED
+};
+
+struct hdmi_hdcp_reg_data {
+ u32 reg_id;
+ u32 off;
+ char *name;
+ u32 reg_val;
+};
+
+struct hdmi_hdcp_ctrl {
+ struct hdmi *hdmi;
+ u32 auth_retries;
+ bool tz_hdcp;
+ enum hdmi_hdcp_state hdcp_state;
+ struct work_struct hdcp_auth_work;
+ struct work_struct hdcp_reauth_work;
+
+#define AUTH_ABORT_EV 1
+#define AUTH_RESULT_RDY_EV 2
+ unsigned long auth_event;
+ wait_queue_head_t auth_event_queue;
+
+ u32 ksv_fifo_w_index;
+ /*
+ * store aksv from qfprom
+ */
+ u32 aksv_lsb;
+ u32 aksv_msb;
+ bool aksv_valid;
+ u32 ds_type;
+ u32 bksv_lsb;
+ u32 bksv_msb;
+ u8 dev_count;
+ u8 depth;
+ u8 ksv_list[5 * 127];
+ bool max_cascade_exceeded;
+ bool max_dev_exceeded;
+};
+
+static int hdmi_ddc_read(struct hdmi *hdmi, u16 addr, u8 offset,
+ u8 *data, u16 data_len)
+{
+ int rc;
+ int retry = 5;
+ struct i2c_msg msgs[] = {
+ {
+ .addr = addr >> 1,
+ .flags = 0,
+ .len = 1,
+ .buf = &offset,
+ }, {
+ .addr = addr >> 1,
+ .flags = I2C_M_RD,
+ .len = data_len,
+ .buf = data,
+ }
+ };
+
+ DBG("Start DDC read");
+retry:
+ rc = i2c_transfer(hdmi->i2c, msgs, 2);
+
+ retry--;
+ if (rc == 2)
+ rc = 0;
+ else if (retry > 0)
+ goto retry;
+ else
+ rc = -EIO;
+
+ DBG("End DDC read %d", rc);
+
+ return rc;
+}
+
+#define HDCP_DDC_WRITE_MAX_BYTE_NUM 32
+
+static int hdmi_ddc_write(struct hdmi *hdmi, u16 addr, u8 offset,
+ u8 *data, u16 data_len)
+{
+ int rc;
+ int retry = 10;
+ u8 buf[HDCP_DDC_WRITE_MAX_BYTE_NUM];
+ struct i2c_msg msgs[] = {
+ {
+ .addr = addr >> 1,
+ .flags = 0,
+ .len = 1,
+ }
+ };
+
+ DBG("Start DDC write");
+ if (data_len > (HDCP_DDC_WRITE_MAX_BYTE_NUM - 1)) {
+ pr_err("%s: write size too big\n", __func__);
+ return -ERANGE;
+ }
+
+ buf[0] = offset;
+ memcpy(&buf[1], data, data_len);
+ msgs[0].buf = buf;
+ msgs[0].len = data_len + 1;
+retry:
+ rc = i2c_transfer(hdmi->i2c, msgs, 1);
+
+ retry--;
+ if (rc == 1)
+ rc = 0;
+ else if (retry > 0)
+ goto retry;
+ else
+ rc = -EIO;
+
+ DBG("End DDC write %d", rc);
+
+ return rc;
+}
+
+static int hdmi_hdcp_scm_wr(struct hdmi_hdcp_ctrl *hdcp_ctrl, u32 *preg,
+ u32 *pdata, u32 count)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ struct qcom_scm_hdcp_req scm_buf[QCOM_SCM_HDCP_MAX_REQ_CNT];
+ u32 resp, phy_addr, idx = 0;
+ int i, ret = 0;
+
+ WARN_ON(!pdata || !preg || (count == 0));
+
+ if (hdcp_ctrl->tz_hdcp) {
+ phy_addr = (u32)hdmi->mmio_phy_addr;
+
+ while (count) {
+ memset(scm_buf, 0, sizeof(scm_buf));
+ for (i = 0; i < count && i < QCOM_SCM_HDCP_MAX_REQ_CNT;
+ i++) {
+ scm_buf[i].addr = phy_addr + preg[idx];
+ scm_buf[i].val = pdata[idx];
+ idx++;
+ }
+ ret = qcom_scm_hdcp_req(scm_buf, i, &resp);
+
+ if (ret || resp) {
+ pr_err("%s: error: scm_call ret=%d resp=%u\n",
+ __func__, ret, resp);
+ ret = -EINVAL;
+ break;
+ }
+
+ count -= i;
+ }
+ } else {
+ for (i = 0; i < count; i++)
+ hdmi_write(hdmi, preg[i], pdata[i]);
+ }
+
+ return ret;
+}
+
+void hdmi_hdcp_irq(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg_val, hdcp_int_status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_INT_CTRL);
+ hdcp_int_status = reg_val & HDCP_INT_STATUS_MASK;
+ if (!hdcp_int_status) {
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+ return;
+ }
+ /* Clear Interrupts */
+ reg_val |= hdcp_int_status << 1;
+ /* Clear AUTH_FAIL_INFO as well */
+ if (hdcp_int_status & HDMI_HDCP_INT_CTRL_AUTH_FAIL_INT)
+ reg_val |= HDMI_HDCP_INT_CTRL_AUTH_FAIL_INFO_ACK;
+ hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ DBG("hdcp irq %x", hdcp_int_status);
+
+ if (hdcp_int_status & HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_INT) {
+ pr_info("%s:AUTH_SUCCESS_INT received\n", __func__);
+ if (HDCP_STATE_AUTHENTICATING == hdcp_ctrl->hdcp_state) {
+ set_bit(AUTH_RESULT_RDY_EV, &hdcp_ctrl->auth_event);
+ wake_up_all(&hdcp_ctrl->auth_event_queue);
+ }
+ }
+
+ if (hdcp_int_status & HDMI_HDCP_INT_CTRL_AUTH_FAIL_INT) {
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS);
+ pr_info("%s: AUTH_FAIL_INT rcvd, LINK0_STATUS=0x%08x\n",
+ __func__, reg_val);
+ if (HDCP_STATE_AUTHENTICATED == hdcp_ctrl->hdcp_state)
+ queue_work(hdmi->workq, &hdcp_ctrl->hdcp_reauth_work);
+ else if (HDCP_STATE_AUTHENTICATING ==
+ hdcp_ctrl->hdcp_state) {
+ set_bit(AUTH_RESULT_RDY_EV, &hdcp_ctrl->auth_event);
+ wake_up_all(&hdcp_ctrl->auth_event_queue);
+ }
+ }
+}
+
+static int hdmi_hdcp_msleep(struct hdmi_hdcp_ctrl *hdcp_ctrl, u32 ms, u32 ev)
+{
+ int rc;
+
+ rc = wait_event_timeout(hdcp_ctrl->auth_event_queue,
+ !!test_bit(ev, &hdcp_ctrl->auth_event),
+ msecs_to_jiffies(ms));
+ if (rc) {
+ pr_info("%s: msleep is canceled by event %d\n",
+ __func__, ev);
+ clear_bit(ev, &hdcp_ctrl->auth_event);
+ return -ECANCELED;
+ }
+
+ return 0;
+}
+
+static int hdmi_hdcp_read_validate_aksv(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+
+ /* Fetch aksv from QFPROM, this info should be public. */
+ hdcp_ctrl->aksv_lsb = hdmi_qfprom_read(hdmi, HDCP_KSV_LSB);
+ hdcp_ctrl->aksv_msb = hdmi_qfprom_read(hdmi, HDCP_KSV_MSB);
+
+ /* check there are 20 ones in AKSV */
+ if ((hweight32(hdcp_ctrl->aksv_lsb) + hweight32(hdcp_ctrl->aksv_msb))
+ != 20) {
+ pr_err("%s: AKSV QFPROM doesn't have 20 1's, 20 0's\n",
+ __func__);
+ pr_err("%s: QFPROM AKSV chk failed (AKSV=%02x%08x)\n",
+ __func__, hdcp_ctrl->aksv_msb,
+ hdcp_ctrl->aksv_lsb);
+ return -EINVAL;
+ }
+ DBG("AKSV=%02x%08x", hdcp_ctrl->aksv_msb, hdcp_ctrl->aksv_lsb);
+
+ return 0;
+}
+
+static int reset_hdcp_ddc_failures(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg_val, failure, nack0;
+ int rc = 0;
+
+ /* Check for any DDC transfer failures */
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_STATUS);
+ failure = reg_val & HDMI_HDCP_DDC_STATUS_FAILED;
+ nack0 = reg_val & HDMI_HDCP_DDC_STATUS_NACK0;
+ DBG("HDCP_DDC_STATUS=0x%x, FAIL=%d, NACK0=%d",
+ reg_val, failure, nack0);
+
+ if (failure) {
+ /*
+ * Indicates that the last HDCP HW DDC transfer failed.
+ * This occurs when a transfer is attempted with HDCP DDC
+ * disabled (HDCP_DDC_DISABLE=1) or the number of retries
+ * matches HDCP_DDC_RETRY_CNT.
+ * Failure occurred, let's clear it.
+ */
+ DBG("DDC failure detected");
+
+ /* First, Disable DDC */
+ hdmi_write(hdmi, REG_HDMI_HDCP_DDC_CTRL_0,
+ HDMI_HDCP_DDC_CTRL_0_DISABLE);
+
+ /* ACK the Failure to Clear it */
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_CTRL_1);
+ reg_val |= HDMI_HDCP_DDC_CTRL_1_FAILED_ACK;
+ hdmi_write(hdmi, REG_HDMI_HDCP_DDC_CTRL_1, reg_val);
+
+ /* Check if the FAILURE got Cleared */
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_STATUS);
+ if (reg_val & HDMI_HDCP_DDC_STATUS_FAILED)
+ pr_info("%s: Unable to clear HDCP DDC Failure\n",
+ __func__);
+
+ /* Re-Enable HDCP DDC */
+ hdmi_write(hdmi, REG_HDMI_HDCP_DDC_CTRL_0, 0);
+ }
+
+ if (nack0) {
+ DBG("Before: HDMI_DDC_SW_STATUS=0x%08x",
+ hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS));
+ /* Reset HDMI DDC software status */
+ reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL);
+ reg_val |= HDMI_DDC_CTRL_SW_STATUS_RESET;
+ hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val);
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+
+ reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL);
+ reg_val &= ~HDMI_DDC_CTRL_SW_STATUS_RESET;
+ hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val);
+
+ /* Reset HDMI DDC Controller */
+ reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL);
+ reg_val |= HDMI_DDC_CTRL_SOFT_RESET;
+ hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val);
+
+ /* If previous msleep is aborted, skip this msleep */
+ if (!rc)
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+
+ reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL);
+ reg_val &= ~HDMI_DDC_CTRL_SOFT_RESET;
+ hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val);
+ DBG("After: HDMI_DDC_SW_STATUS=0x%08x",
+ hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS));
+ }
+
+ return rc;
+}
+
+static int hdmi_hdcp_hw_ddc_clean(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc;
+ u32 hdcp_ddc_status, ddc_hw_status;
+ u32 xfer_done, xfer_req, hw_done;
+ bool hw_not_ready;
+ u32 timeout_count;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+
+ if (hdmi_read(hdmi, REG_HDMI_DDC_HW_STATUS) == 0)
+ return 0;
+
+ /* Wait to be clean on DDC HW engine */
+ timeout_count = 100;
+ do {
+ hdcp_ddc_status = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_STATUS);
+ ddc_hw_status = hdmi_read(hdmi, REG_HDMI_DDC_HW_STATUS);
+
+ xfer_done = hdcp_ddc_status & HDMI_HDCP_DDC_STATUS_XFER_DONE;
+ xfer_req = hdcp_ddc_status & HDMI_HDCP_DDC_STATUS_XFER_REQ;
+ hw_done = ddc_hw_status & HDMI_DDC_HW_STATUS_DONE;
+ hw_not_ready = !xfer_done || xfer_req || !hw_done;
+
+ if (hw_not_ready)
+ break;
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_warn("%s: hw_ddc_clean failed\n", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ return 0;
+}
+
+static void hdmi_hdcp_reauth_work(struct work_struct *work)
+{
+ struct hdmi_hdcp_ctrl *hdcp_ctrl = container_of(work,
+ struct hdmi_hdcp_ctrl, hdcp_reauth_work);
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ unsigned long flags;
+ u32 reg_val;
+
+ DBG("HDCP REAUTH WORK");
+ /*
+ * Disable HPD circuitry.
+ * This is needed to reset the HDCP cipher engine so that when we
+ * attempt a re-authentication, HW would clear the AN0_READY and
+ * AN1_READY bits in HDMI_HDCP_LINK0_STATUS register
+ */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
+ reg_val &= ~HDMI_HPD_CTRL_ENABLE;
+ hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val);
+
+ /* Disable HDCP interrupts */
+ hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, 0);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ hdmi_write(hdmi, REG_HDMI_HDCP_RESET,
+ HDMI_HDCP_RESET_LINK0_DEAUTHENTICATE);
+
+ /* Wait to be clean on DDC HW engine */
+ if (hdmi_hdcp_hw_ddc_clean(hdcp_ctrl)) {
+ pr_info("%s: reauth work aborted\n", __func__);
+ return;
+ }
+
+ /* Disable encryption and disable the HDCP block */
+ hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, 0);
+
+ /* Enable HPD circuitry */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
+ reg_val |= HDMI_HPD_CTRL_ENABLE;
+ hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ /*
+ * Only retry defined times then abort current authenticating process
+ */
+ if (++hdcp_ctrl->auth_retries == AUTH_RETRIES_TIME) {
+ hdcp_ctrl->hdcp_state = HDCP_STATE_INACTIVE;
+ hdcp_ctrl->auth_retries = 0;
+ pr_info("%s: abort reauthentication!\n", __func__);
+
+ return;
+ }
+
+ DBG("Queue AUTH WORK");
+ hdcp_ctrl->hdcp_state = HDCP_STATE_AUTHENTICATING;
+ queue_work(hdmi->workq, &hdcp_ctrl->hdcp_auth_work);
+}
+
+static int hdmi_hdcp_auth_prepare(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 link0_status;
+ u32 reg_val;
+ unsigned long flags;
+ int rc;
+
+ if (!hdcp_ctrl->aksv_valid) {
+ rc = hdmi_hdcp_read_validate_aksv(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: ASKV validation failed\n", __func__);
+ hdcp_ctrl->hdcp_state = HDCP_STATE_NO_AKSV;
+ return -ENOTSUPP;
+ }
+ hdcp_ctrl->aksv_valid = true;
+ }
+
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ /* disable HDMI Encrypt */
+ reg_val = hdmi_read(hdmi, REG_HDMI_CTRL);
+ reg_val &= ~HDMI_CTRL_ENCRYPTED;
+ hdmi_write(hdmi, REG_HDMI_CTRL, reg_val);
+
+ /* Enabling Software DDC */
+ reg_val = hdmi_read(hdmi, REG_HDMI_DDC_ARBITRATION);
+ reg_val &= ~HDMI_DDC_ARBITRATION_HW_ARBITRATION;
+ hdmi_write(hdmi, REG_HDMI_DDC_ARBITRATION, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ /*
+ * Write AKSV read from QFPROM to the HDCP registers.
+ * This step is needed for HDCP authentication and must be
+ * written before enabling HDCP.
+ */
+ hdmi_write(hdmi, REG_HDMI_HDCP_SW_LOWER_AKSV, hdcp_ctrl->aksv_lsb);
+ hdmi_write(hdmi, REG_HDMI_HDCP_SW_UPPER_AKSV, hdcp_ctrl->aksv_msb);
+
+ /*
+ * HDCP setup prior to enabling HDCP_CTRL.
+ * Setup seed values for random number An.
+ */
+ hdmi_write(hdmi, REG_HDMI_HDCP_ENTROPY_CTRL0, 0xB1FFB0FF);
+ hdmi_write(hdmi, REG_HDMI_HDCP_ENTROPY_CTRL1, 0xF00DFACE);
+
+ /* Disable the RngCipher state */
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DEBUG_CTRL);
+ reg_val &= ~HDMI_HDCP_DEBUG_CTRL_RNG_CIPHER;
+ hdmi_write(hdmi, REG_HDMI_HDCP_DEBUG_CTRL, reg_val);
+ DBG("HDCP_DEBUG_CTRL=0x%08x",
+ hdmi_read(hdmi, REG_HDMI_HDCP_DEBUG_CTRL));
+
+ /*
+ * Ensure that all register writes are completed before
+ * enabling HDCP cipher
+ */
+ wmb();
+
+ /*
+ * Enable HDCP
+ * This needs to be done as early as possible in order for the
+ * hardware to make An available to read
+ */
+ hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, HDMI_HDCP_CTRL_ENABLE);
+
+ /*
+ * If we had stale values for the An ready bit, it should most
+ * likely be cleared now after enabling HDCP cipher
+ */
+ link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS);
+ DBG("After enabling HDCP Link0_Status=0x%08x", link0_status);
+ if (!(link0_status &
+ (HDMI_HDCP_LINK0_STATUS_AN_0_READY |
+ HDMI_HDCP_LINK0_STATUS_AN_1_READY)))
+ DBG("An not ready after enabling HDCP");
+
+ /* Clear any DDC failures from previous tries before enable HDCP*/
+ rc = reset_hdcp_ddc_failures(hdcp_ctrl);
+
+ return rc;
+}
+
+static void hdmi_hdcp_auth_fail(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg_val;
+ unsigned long flags;
+
+ DBG("hdcp auth failed, queue reauth work");
+ /* clear HDMI Encrypt */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_CTRL);
+ reg_val &= ~HDMI_CTRL_ENCRYPTED;
+ hdmi_write(hdmi, REG_HDMI_CTRL, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ hdcp_ctrl->hdcp_state = HDCP_STATE_AUTH_FAILED;
+ queue_work(hdmi->workq, &hdcp_ctrl->hdcp_reauth_work);
+}
+
+static void hdmi_hdcp_auth_done(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg_val;
+ unsigned long flags;
+
+ /*
+ * Disable software DDC before going into part3 to make sure
+ * there is no Arbitration between software and hardware for DDC
+ */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_DDC_ARBITRATION);
+ reg_val |= HDMI_DDC_ARBITRATION_HW_ARBITRATION;
+ hdmi_write(hdmi, REG_HDMI_DDC_ARBITRATION, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ /* enable HDMI Encrypt */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_CTRL);
+ reg_val |= HDMI_CTRL_ENCRYPTED;
+ hdmi_write(hdmi, REG_HDMI_CTRL, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ hdcp_ctrl->hdcp_state = HDCP_STATE_AUTHENTICATED;
+ hdcp_ctrl->auth_retries = 0;
+}
+
+/*
+ * hdcp authenticating part 1
+ * Wait Key/An ready
+ * Read BCAPS from sink
+ * Write BCAPS and AKSV into HDCP engine
+ * Write An and AKSV to sink
+ * Read BKSV from sink and write into HDCP engine
+ */
+static int hdmi_hdcp_wait_key_an_ready(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 link0_status, keys_state;
+ u32 timeout_count;
+ bool an_ready;
+
+ /* Wait for HDCP keys to be checked and validated */
+ timeout_count = 100;
+ do {
+ link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS);
+ keys_state = (link0_status >> 28) & 0x7;
+ if (keys_state == HDCP_KEYS_STATE_VALID)
+ break;
+
+ DBG("Keys not ready(%d). s=%d, l0=%0x08x",
+ timeout_count, keys_state, link0_status);
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_err("%s: Wait key state timedout", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ timeout_count = 100;
+ do {
+ link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS);
+ an_ready = (link0_status & HDMI_HDCP_LINK0_STATUS_AN_0_READY)
+ && (link0_status & HDMI_HDCP_LINK0_STATUS_AN_1_READY);
+ if (an_ready)
+ break;
+
+ DBG("An not ready(%d). l0_status=0x%08x",
+ timeout_count, link0_status);
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_err("%s: Wait An timedout", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ return 0;
+}
+
+static int hdmi_hdcp_send_aksv_an(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc = 0;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 link0_aksv_0, link0_aksv_1;
+ u32 link0_an[2];
+ u8 aksv[5];
+
+ /* Read An0 and An1 */
+ link0_an[0] = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA5);
+ link0_an[1] = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA6);
+
+ /* Read AKSV */
+ link0_aksv_0 = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA3);
+ link0_aksv_1 = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA4);
+
+ DBG("Link ASKV=%08x%08x", link0_aksv_0, link0_aksv_1);
+ /* Copy An and AKSV to byte arrays for transmission */
+ aksv[0] = link0_aksv_0 & 0xFF;
+ aksv[1] = (link0_aksv_0 >> 8) & 0xFF;
+ aksv[2] = (link0_aksv_0 >> 16) & 0xFF;
+ aksv[3] = (link0_aksv_0 >> 24) & 0xFF;
+ aksv[4] = link0_aksv_1 & 0xFF;
+
+ /* Write An to offset 0x18 */
+ rc = hdmi_ddc_write(hdmi, HDCP_PORT_ADDR, 0x18, (u8 *)link0_an,
+ (u16)sizeof(link0_an));
+ if (rc) {
+ pr_err("%s:An write failed\n", __func__);
+ return rc;
+ }
+ DBG("Link0-An=%08x%08x", link0_an[0], link0_an[1]);
+
+ /* Write AKSV to offset 0x10 */
+ rc = hdmi_ddc_write(hdmi, HDCP_PORT_ADDR, 0x10, aksv, 5);
+ if (rc) {
+ pr_err("%s:AKSV write failed\n", __func__);
+ return rc;
+ }
+ DBG("Link0-AKSV=%02x%08x", link0_aksv_1 & 0xFF, link0_aksv_0);
+
+ return 0;
+}
+
+static int hdmi_hdcp_recv_bksv(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc = 0;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u8 bksv[5];
+ u32 reg[2], data[2];
+
+ /* Read BKSV at offset 0x00 */
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x00, bksv, 5);
+ if (rc) {
+ pr_err("%s:BKSV read failed\n", __func__);
+ return rc;
+ }
+
+ hdcp_ctrl->bksv_lsb = bksv[0] | (bksv[1] << 8) |
+ (bksv[2] << 16) | (bksv[3] << 24);
+ hdcp_ctrl->bksv_msb = bksv[4];
+ DBG(":BKSV=%02x%08x", hdcp_ctrl->bksv_msb, hdcp_ctrl->bksv_lsb);
+
+ /* check there are 20 ones in BKSV */
+ if ((hweight32(hdcp_ctrl->bksv_lsb) + hweight32(hdcp_ctrl->bksv_msb))
+ != 20) {
+ pr_err(": BKSV doesn't have 20 1's and 20 0's\n");
+ pr_err(": BKSV chk fail. BKSV=%02x%02x%02x%02x%02x\n",
+ bksv[4], bksv[3], bksv[2], bksv[1], bksv[0]);
+ return -EINVAL;
+ }
+
+ /* Write BKSV read from sink to HDCP registers */
+ reg[0] = REG_HDMI_HDCP_RCVPORT_DATA0;
+ data[0] = hdcp_ctrl->bksv_lsb;
+ reg[1] = REG_HDMI_HDCP_RCVPORT_DATA1;
+ data[1] = hdcp_ctrl->bksv_msb;
+ rc = hdmi_hdcp_scm_wr(hdcp_ctrl, reg, data, 2);
+
+ return rc;
+}
+
+static int hdmi_hdcp_recv_bcaps(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc = 0;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg, data;
+ u8 bcaps;
+
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x40, &bcaps, 1);
+ if (rc) {
+ pr_err("%s:BCAPS read failed\n", __func__);
+ return rc;
+ }
+ DBG("BCAPS=%02x", bcaps);
+
+ /* receiver (0), repeater (1) */
+ hdcp_ctrl->ds_type = (bcaps & BIT(6)) ? DS_REPEATER : DS_RECEIVER;
+
+ /* Write BCAPS to the hardware */
+ reg = REG_HDMI_HDCP_RCVPORT_DATA12;
+ data = (u32)bcaps;
+ rc = hdmi_hdcp_scm_wr(hdcp_ctrl, ®, &data, 1);
+
+ return rc;
+}
+
+static int hdmi_hdcp_auth_part1_key_exchange(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ unsigned long flags;
+ int rc;
+
+ /* Wait for AKSV key and An ready */
+ rc = hdmi_hdcp_wait_key_an_ready(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: wait key and an ready failed\n", __func__);
+ return rc;
+ };
+
+ /* Read BCAPS and send to HDCP engine */
+ rc = hdmi_hdcp_recv_bcaps(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: read bcaps error, abort\n", __func__);
+ return rc;
+ }
+
+ /*
+ * 1.1_Features turned off by default.
+ * No need to write AInfo since 1.1_Features is disabled.
+ */
+ hdmi_write(hdmi, REG_HDMI_HDCP_RCVPORT_DATA4, 0);
+
+ /* Send AKSV and An to sink */
+ rc = hdmi_hdcp_send_aksv_an(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s:An/Aksv write failed\n", __func__);
+ return rc;
+ }
+
+ /* Read BKSV and send to HDCP engine*/
+ rc = hdmi_hdcp_recv_bksv(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s:BKSV Process failed\n", __func__);
+ return rc;
+ }
+
+ /* Enable HDCP interrupts and ack/clear any stale interrupts */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL,
+ HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_ACK |
+ HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_MASK |
+ HDMI_HDCP_INT_CTRL_AUTH_FAIL_ACK |
+ HDMI_HDCP_INT_CTRL_AUTH_FAIL_MASK |
+ HDMI_HDCP_INT_CTRL_AUTH_FAIL_INFO_ACK);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ return 0;
+}
+
+/* read R0' from sink and pass it to HDCP engine */
+static int hdmi_hdcp_auth_part1_recv_r0(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ int rc = 0;
+ u8 buf[2];
+
+ /*
+ * HDCP Compliance Test case 1A-01:
+ * Wait here at least 100ms before reading R0'
+ */
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 125, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+
+ /* Read R0' at offset 0x08 */
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x08, buf, 2);
+ if (rc) {
+ pr_err("%s:R0' read failed\n", __func__);
+ return rc;
+ }
+ DBG("R0'=%02x%02x", buf[1], buf[0]);
+
+ /* Write R0' to HDCP registers and check to see if it is a match */
+ hdmi_write(hdmi, REG_HDMI_HDCP_RCVPORT_DATA2_0,
+ (((u32)buf[1]) << 8) | buf[0]);
+
+ return 0;
+}
+
+/* Wait for authenticating result: R0/R0' are matched or not */
+static int hdmi_hdcp_auth_part1_verify_r0(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 link0_status;
+ int rc;
+
+ /* wait for hdcp irq, 10 sec should be long enough */
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 10000, AUTH_RESULT_RDY_EV);
+ if (!rc) {
+ pr_err("%s: Wait Auth IRQ timeout\n", __func__);
+ return -ETIMEDOUT;
+ }
+
+ link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS);
+ if (!(link0_status & HDMI_HDCP_LINK0_STATUS_RI_MATCHES)) {
+ pr_err("%s: Authentication Part I failed\n", __func__);
+ return -EINVAL;
+ }
+
+ /* Enable HDCP Encryption */
+ hdmi_write(hdmi, REG_HDMI_HDCP_CTRL,
+ HDMI_HDCP_CTRL_ENABLE |
+ HDMI_HDCP_CTRL_ENCRYPTION_ENABLE);
+
+ return 0;
+}
+
+static int hdmi_hdcp_recv_check_bstatus(struct hdmi_hdcp_ctrl *hdcp_ctrl,
+ u16 *pbstatus)
+{
+ int rc;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ bool max_devs_exceeded = false, max_cascade_exceeded = false;
+ u32 repeater_cascade_depth = 0, down_stream_devices = 0;
+ u16 bstatus;
+ u8 buf[2];
+
+ /* Read BSTATUS at offset 0x41 */
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x41, buf, 2);
+ if (rc) {
+ pr_err("%s: BSTATUS read failed\n", __func__);
+ goto error;
+ }
+ *pbstatus = bstatus = (buf[1] << 8) | buf[0];
+
+
+ down_stream_devices = bstatus & 0x7F;
+ repeater_cascade_depth = (bstatus >> 8) & 0x7;
+ max_devs_exceeded = (bstatus & BIT(7)) ? true : false;
+ max_cascade_exceeded = (bstatus & BIT(11)) ? true : false;
+
+ if (down_stream_devices == 0) {
+ /*
+ * If no downstream devices are attached to the repeater
+ * then part II fails.
+ * todo: The other approach would be to continue PART II.
+ */
+ pr_err("%s: No downstream devices\n", __func__);
+ rc = -EINVAL;
+ goto error;
+ }
+
+ /*
+ * HDCP Compliance 1B-05:
+ * Check if no. of devices connected to repeater
+ * exceed max_devices_connected from bit 7 of Bstatus.
+ */
+ if (max_devs_exceeded) {
+ pr_err("%s: no. of devs connected exceeds max allowed",
+ __func__);
+ rc = -EINVAL;
+ goto error;
+ }
+
+ /*
+ * HDCP Compliance 1B-06:
+ * Check if no. of cascade connected to repeater
+ * exceed max_cascade_connected from bit 11 of Bstatus.
+ */
+ if (max_cascade_exceeded) {
+ pr_err("%s: no. of cascade conn exceeds max allowed",
+ __func__);
+ rc = -EINVAL;
+ goto error;
+ }
+
+error:
+ hdcp_ctrl->dev_count = down_stream_devices;
+ hdcp_ctrl->max_cascade_exceeded = max_cascade_exceeded;
+ hdcp_ctrl->max_dev_exceeded = max_devs_exceeded;
+ hdcp_ctrl->depth = repeater_cascade_depth;
+ return rc;
+}
+
+static int hdmi_hdcp_auth_part2_wait_ksv_fifo_ready(
+ struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg, data;
+ u32 timeout_count;
+ u16 bstatus;
+ u8 bcaps;
+
+ /*
+ * Wait until READY bit is set in BCAPS, as per HDCP specifications
+ * maximum permitted time to check for READY bit is five seconds.
+ */
+ timeout_count = 100;
+ do {
+ /* Read BCAPS at offset 0x40 */
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x40, &bcaps, 1);
+ if (rc) {
+ pr_err("%s: BCAPS read failed\n", __func__);
+ return rc;
+ }
+
+ if (bcaps & BIT(5))
+ break;
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_err("%s: Wait KSV fifo ready timedout", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ rc = hdmi_hdcp_recv_check_bstatus(hdcp_ctrl, &bstatus);
+ if (rc) {
+ pr_err("%s: bstatus error\n", __func__);
+ return rc;
+ }
+
+ /* Write BSTATUS and BCAPS to HDCP registers */
+ reg = REG_HDMI_HDCP_RCVPORT_DATA12;
+ data = bcaps | (bstatus << 8);
+ rc = hdmi_hdcp_scm_wr(hdcp_ctrl, ®, &data, 1);
+ if (rc) {
+ pr_err("%s: BSTATUS write failed\n", __func__);
+ return rc;
+ }
+
+ return 0;
+}
+
+/*
+ * hdcp authenticating part 2: 2nd
+ * read ksv fifo from sink
+ * transfer V' from sink to HDCP engine
+ * reset SHA engine
+ */
+static int hdmi_hdcp_transfer_v_h(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ int rc = 0;
+ struct hdmi_hdcp_reg_data reg_data[] = {
+ {REG_HDMI_HDCP_RCVPORT_DATA7, 0x20, "V' H0"},
+ {REG_HDMI_HDCP_RCVPORT_DATA8, 0x24, "V' H1"},
+ {REG_HDMI_HDCP_RCVPORT_DATA9, 0x28, "V' H2"},
+ {REG_HDMI_HDCP_RCVPORT_DATA10, 0x2C, "V' H3"},
+ {REG_HDMI_HDCP_RCVPORT_DATA11, 0x30, "V' H4"},
+ };
+ struct hdmi_hdcp_reg_data *rd;
+ u32 size = ARRAY_SIZE(reg_data);
+ u32 reg[ARRAY_SIZE(reg_data)];
+ u32 data[ARRAY_SIZE(reg_data)];
+ int i;
+
+ for (i = 0; i < size; i++) {
+ rd = ®_data[i];
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR,
+ rd->off, (u8 *)&data[i], (u16)sizeof(data[i]));
+ if (rc) {
+ pr_err("%s: Read %s failed\n", __func__, rd->name);
+ goto error;
+ }
+
+ DBG("%s =%x", rd->name, data[i]);
+ reg[i] = reg_data[i].reg_id;
+ }
+
+ rc = hdmi_hdcp_scm_wr(hdcp_ctrl, reg, data, size);
+
+error:
+ return rc;
+}
+
+static int hdmi_hdcp_recv_ksv_fifo(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 ksv_bytes;
+
+ ksv_bytes = 5 * hdcp_ctrl->dev_count;
+
+ rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x43,
+ hdcp_ctrl->ksv_list, ksv_bytes);
+ if (rc)
+ pr_err("%s: KSV FIFO read failed\n", __func__);
+
+ return rc;
+}
+
+static int hdmi_hdcp_reset_sha_engine(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ u32 reg[2], data[2];
+ u32 rc = 0;
+
+ reg[0] = REG_HDMI_HDCP_SHA_CTRL;
+ data[0] = HDCP_REG_ENABLE;
+ reg[1] = REG_HDMI_HDCP_SHA_CTRL;
+ data[1] = HDCP_REG_DISABLE;
+
+ rc = hdmi_hdcp_scm_wr(hdcp_ctrl, reg, data, 2);
+
+ return rc;
+}
+
+static int hdmi_hdcp_auth_part2_recv_ksv_fifo(
+ struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc;
+ u32 timeout_count;
+
+ /*
+ * Read KSV FIFO over DDC
+ * Key Selection vector FIFO Used to pull downstream KSVs
+ * from HDCP Repeaters.
+ * All bytes (DEVICE_COUNT * 5) must be read in a single,
+ * auto incrementing access.
+ * All bytes read as 0x00 for HDCP Receivers that are not
+ * HDCP Repeaters (REPEATER == 0).
+ */
+ timeout_count = 100;
+ do {
+ rc = hdmi_hdcp_recv_ksv_fifo(hdcp_ctrl);
+ if (!rc)
+ break;
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_err("%s: Recv ksv fifo timedout", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 25, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ rc = hdmi_hdcp_transfer_v_h(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: transfer V failed\n", __func__);
+ return rc;
+ }
+
+ /* reset SHA engine before write ksv fifo */
+ rc = hdmi_hdcp_reset_sha_engine(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: fail to reset sha engine\n", __func__);
+ return rc;
+ }
+
+ return 0;
+}
+
+/*
+ * Write KSV FIFO to HDCP_SHA_DATA.
+ * This is done 1 byte at time starting with the LSB.
+ * Once 64 bytes have been written, we need to poll for
+ * HDCP_SHA_BLOCK_DONE before writing any further
+ * If the last byte is written, we need to poll for
+ * HDCP_SHA_COMP_DONE to wait until HW finish
+ */
+static int hdmi_hdcp_write_ksv_fifo(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int i;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 ksv_bytes, last_byte = 0;
+ u8 *ksv_fifo = NULL;
+ u32 reg_val, data, reg;
+ u32 rc = 0;
+
+ ksv_bytes = 5 * hdcp_ctrl->dev_count;
+
+ /* Check if need to wait for HW completion */
+ if (hdcp_ctrl->ksv_fifo_w_index) {
+ reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_SHA_STATUS);
+ DBG("HDCP_SHA_STATUS=%08x", reg_val);
+ if (hdcp_ctrl->ksv_fifo_w_index == ksv_bytes) {
+ /* check COMP_DONE if last write */
+ if (reg_val & HDMI_HDCP_SHA_STATUS_COMP_DONE) {
+ DBG("COMP_DONE");
+ return 0;
+ } else {
+ return -EAGAIN;
+ }
+ } else {
+ /* check BLOCK_DONE if not last write */
+ if (!(reg_val & HDMI_HDCP_SHA_STATUS_BLOCK_DONE))
+ return -EAGAIN;
+
+ DBG("BLOCK_DONE");
+ }
+ }
+
+ ksv_bytes -= hdcp_ctrl->ksv_fifo_w_index;
+ if (ksv_bytes <= 64)
+ last_byte = 1;
+ else
+ ksv_bytes = 64;
+
+ ksv_fifo = hdcp_ctrl->ksv_list;
+ ksv_fifo += hdcp_ctrl->ksv_fifo_w_index;
+
+ for (i = 0; i < ksv_bytes; i++) {
+ /* Write KSV byte and set DONE bit[0] for last byte*/
+ reg_val = ksv_fifo[i] << 16;
+ if ((i == (ksv_bytes - 1)) && last_byte)
+ reg_val |= HDMI_HDCP_SHA_DATA_DONE;
+
+ reg = REG_HDMI_HDCP_SHA_DATA;
+ data = reg_val;
+ rc = hdmi_hdcp_scm_wr(hdcp_ctrl, ®, &data, 1);
+
+ if (rc)
+ return rc;
+ }
+
+ hdcp_ctrl->ksv_fifo_w_index += ksv_bytes;
+
+ /*
+ *return -EAGAIN to notify caller to wait for COMP_DONE or BLOCK_DONE
+ */
+ return -EAGAIN;
+}
+
+/* write ksv fifo into HDCP engine */
+static int hdmi_hdcp_auth_part2_write_ksv_fifo(
+ struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc;
+ u32 timeout_count;
+
+ hdcp_ctrl->ksv_fifo_w_index = 0;
+ timeout_count = 100;
+ do {
+ rc = hdmi_hdcp_write_ksv_fifo(hdcp_ctrl);
+ if (!rc)
+ break;
+
+ if (rc != -EAGAIN)
+ return rc;
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_err("%s: Write KSV fifo timedout", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ return 0;
+}
+
+static int hdmi_hdcp_auth_part2_check_v_match(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ int rc = 0;
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 link0_status;
+ u32 timeout_count = 100;
+
+ do {
+ link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS);
+ if (link0_status & HDMI_HDCP_LINK0_STATUS_V_MATCHES)
+ break;
+
+ timeout_count--;
+ if (!timeout_count) {
+ pr_err("%s: HDCP V Match timedout", __func__);
+ return -ETIMEDOUT;
+ }
+
+ rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV);
+ if (rc)
+ return rc;
+ } while (1);
+
+ return 0;
+}
+
+static void hdmi_hdcp_auth_work(struct work_struct *work)
+{
+ struct hdmi_hdcp_ctrl *hdcp_ctrl = container_of(work,
+ struct hdmi_hdcp_ctrl, hdcp_auth_work);
+ int rc;
+
+ rc = hdmi_hdcp_auth_prepare(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: auth prepare failed %d\n", __func__, rc);
+ goto end;
+ }
+
+ /* HDCP PartI */
+ rc = hdmi_hdcp_auth_part1_key_exchange(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: key exchange failed %d\n", __func__, rc);
+ goto end;
+ }
+
+ rc = hdmi_hdcp_auth_part1_recv_r0(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: receive r0 failed %d\n", __func__, rc);
+ goto end;
+ }
+
+ rc = hdmi_hdcp_auth_part1_verify_r0(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: verify r0 failed %d\n", __func__, rc);
+ goto end;
+ }
+ pr_info("%s: Authentication Part I successful\n", __func__);
+ if (hdcp_ctrl->ds_type == DS_RECEIVER)
+ goto end;
+
+ /* HDCP PartII */
+ rc = hdmi_hdcp_auth_part2_wait_ksv_fifo_ready(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: wait ksv fifo ready failed %d\n", __func__, rc);
+ goto end;
+ }
+
+ rc = hdmi_hdcp_auth_part2_recv_ksv_fifo(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: recv ksv fifo failed %d\n", __func__, rc);
+ goto end;
+ }
+
+ rc = hdmi_hdcp_auth_part2_write_ksv_fifo(hdcp_ctrl);
+ if (rc) {
+ pr_err("%s: write ksv fifo failed %d\n", __func__, rc);
+ goto end;
+ }
+
+ rc = hdmi_hdcp_auth_part2_check_v_match(hdcp_ctrl);
+ if (rc)
+ pr_err("%s: check v match failed %d\n", __func__, rc);
+
+end:
+ if (rc == -ECANCELED) {
+ pr_info("%s: hdcp authentication canceled\n", __func__);
+ } else if (rc == -ENOTSUPP) {
+ pr_info("%s: hdcp is not supported\n", __func__);
+ } else if (rc) {
+ pr_err("%s: hdcp authentication failed\n", __func__);
+ hdmi_hdcp_auth_fail(hdcp_ctrl);
+ } else {
+ hdmi_hdcp_auth_done(hdcp_ctrl);
+ }
+}
+
+void hdmi_hdcp_on(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ u32 reg_val;
+ unsigned long flags;
+
+ if ((HDCP_STATE_INACTIVE != hdcp_ctrl->hdcp_state) ||
+ (HDCP_STATE_NO_AKSV == hdcp_ctrl->hdcp_state)) {
+ DBG("still active or activating or no askv. returning");
+ return;
+ }
+
+ /* clear HDMI Encrypt */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_CTRL);
+ reg_val &= ~HDMI_CTRL_ENCRYPTED;
+ hdmi_write(hdmi, REG_HDMI_CTRL, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ hdcp_ctrl->auth_event = 0;
+ hdcp_ctrl->hdcp_state = HDCP_STATE_AUTHENTICATING;
+ hdcp_ctrl->auth_retries = 0;
+ queue_work(hdmi->workq, &hdcp_ctrl->hdcp_auth_work);
+}
+
+void hdmi_hdcp_off(struct hdmi_hdcp_ctrl *hdcp_ctrl)
+{
+ struct hdmi *hdmi = hdcp_ctrl->hdmi;
+ unsigned long flags;
+ u32 reg_val;
+
+ if ((HDCP_STATE_INACTIVE == hdcp_ctrl->hdcp_state) ||
+ (HDCP_STATE_NO_AKSV == hdcp_ctrl->hdcp_state)) {
+ DBG("hdcp inactive or no aksv. returning");
+ return;
+ }
+
+ /*
+ * Disable HPD circuitry.
+ * This is needed to reset the HDCP cipher engine so that when we
+ * attempt a re-authentication, HW would clear the AN0_READY and
+ * AN1_READY bits in HDMI_HDCP_LINK0_STATUS register
+ */
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
+ reg_val &= ~HDMI_HPD_CTRL_ENABLE;
+ hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val);
+
+ /*
+ * Disable HDCP interrupts.
+ * Also, need to set the state to inactive here so that any ongoing
+ * reauth works will know that the HDCP session has been turned off.
+ */
+ hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, 0);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ /*
+ * Cancel any pending auth/reauth attempts.
+ * If one is ongoing, this will wait for it to finish.
+ * No more reauthentication attempts will be scheduled since we
+ * set the current state to inactive.
+ */
+ set_bit(AUTH_ABORT_EV, &hdcp_ctrl->auth_event);
+ wake_up_all(&hdcp_ctrl->auth_event_queue);
+ cancel_work_sync(&hdcp_ctrl->hdcp_auth_work);
+ cancel_work_sync(&hdcp_ctrl->hdcp_reauth_work);
+
+ hdmi_write(hdmi, REG_HDMI_HDCP_RESET,
+ HDMI_HDCP_RESET_LINK0_DEAUTHENTICATE);
+
+ /* Disable encryption and disable the HDCP block */
+ hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, 0);
+
+ spin_lock_irqsave(&hdmi->reg_lock, flags);
+ reg_val = hdmi_read(hdmi, REG_HDMI_CTRL);
+ reg_val &= ~HDMI_CTRL_ENCRYPTED;
+ hdmi_write(hdmi, REG_HDMI_CTRL, reg_val);
+
+ /* Enable HPD circuitry */
+ reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
+ reg_val |= HDMI_HPD_CTRL_ENABLE;
+ hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val);
+ spin_unlock_irqrestore(&hdmi->reg_lock, flags);
+
+ hdcp_ctrl->hdcp_state = HDCP_STATE_INACTIVE;
+
+ DBG("HDCP: Off");
+}
+
+struct hdmi_hdcp_ctrl *hdmi_hdcp_init(struct hdmi *hdmi)
+{
+ struct hdmi_hdcp_ctrl *hdcp_ctrl = NULL;
+
+ if (!hdmi->qfprom_mmio) {
+ pr_err("%s: HDCP is not supported without qfprom\n",
+ __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ hdcp_ctrl = kzalloc(sizeof(*hdcp_ctrl), GFP_KERNEL);
+ if (!hdcp_ctrl)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_WORK(&hdcp_ctrl->hdcp_auth_work, hdmi_hdcp_auth_work);
+ INIT_WORK(&hdcp_ctrl->hdcp_reauth_work, hdmi_hdcp_reauth_work);
+ init_waitqueue_head(&hdcp_ctrl->auth_event_queue);
+ hdcp_ctrl->hdmi = hdmi;
+ hdcp_ctrl->hdcp_state = HDCP_STATE_INACTIVE;
+ hdcp_ctrl->aksv_valid = false;
+
+ if (qcom_scm_hdcp_available())
+ hdcp_ctrl->tz_hdcp = true;
+ else
+ hdcp_ctrl->tz_hdcp = false;
+
+ return hdcp_ctrl;
+}
+
+void hdmi_hdcp_destroy(struct hdmi *hdmi)
+{
+ if (hdmi && hdmi->hdcp_ctrl) {
+ kfree(hdmi->hdcp_ctrl);
+ hdmi->hdcp_ctrl = NULL;
+ }
+}
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